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Tsirkin" , Pekka Enberg , Peter Zijlstra , Petr Mladek , Steven Rostedt , Thomas Gleixner , Vasily Gorbik , Vegard Nossum , Vlastimil Babka , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Eric Biggers Subject: Re: [PATCH v4 29/45] block: kmsan: skip bio block merging logic for KMSAN Message-ID: References: <20220701142310.2188015-1-glider@google.com> <20220701142310.2188015-30-glider@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220701142310.2188015-30-glider@google.com> User-Agent: Mutt/2.2.3 (2022-04-12) ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1657707781; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=p3iDfE6X71ht0fb+AD37KbLhdKay+NMX0GxKDHXhdRo=; b=x0ndlLf6HB9oaMJW2Zi2i2Adqy1pEJgmDkKY8h9+fl7pDlqx1FMz0ds0/UZky13d8YPP+d meifVbFkMlsUmzG6TFyJ06Ms+7OpkNjsSjDo4rdHQHcjaBZFKrPRe4KiIvqI5AR6EyakDW 4bfEFZaPLu/ZWCv9wCZ8lfFMo1AW1fE= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=q5OYPMJH; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf28.hostedemail.com: domain of elver@google.com designates 209.85.221.41 as permitted sender) smtp.mailfrom=elver@google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1657707781; a=rsa-sha256; cv=none; b=ih1rH+tm6VJj5uAnXwWCvOB7rAzjjKu9gV2r3QKu/zzNP6OaL5pT8n9TycGYA/6jVLebiA QeKwxnp0rl3b9Nx4Xa/KLggGiabV+F6dLLB3iqCjU1q0Pko4Z5MNLlL3Z+6iDs4iAjpdNh BUKWYDL89WjL3vXB2xuuch0sYals2m8= X-Stat-Signature: okdbf1af85g3o614yojycask9wocet79 X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 728E1C007A Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=q5OYPMJH; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf28.hostedemail.com: domain of elver@google.com designates 209.85.221.41 as permitted sender) smtp.mailfrom=elver@google.com X-Rspam-User: X-HE-Tag: 1657707781-816312 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jul 01, 2022 at 04:22PM +0200, 'Alexander Potapenko' via kasan-dev wrote: [...] > --- a/block/bio.c > +++ b/block/bio.c > @@ -867,6 +867,8 @@ static inline bool page_is_mergeable(const struct bio_vec *bv, > return false; > > *same_page = ((vec_end_addr & PAGE_MASK) == page_addr); > + if (!*same_page && IS_ENABLED(CONFIG_KMSAN)) > + return false; > if (*same_page) > return true; if (*same_page) return true; else if (IS_ENABLED(CONFIG_KMSAN)) return false; > return (bv->bv_page + bv_end / PAGE_SIZE) == (page + off / PAGE_SIZE);